Use english error msg in xml.result

storage/connect/mysql-test/connect/r/xml.result

@@ -374,7 +374,7 @@ INSERT INTO t1 VALUES (_cp1251 0xC0C1C2C3);
 Warnings:
 Level	Warning
 Code	1105
-Message	Com error: Impossible d'enregistrer le caractre dans le codage iso-8859-1.
+Message	Com error: Unable to save character to 'iso-8859-1' encoding.
 
 INSERT INTO t1 VALUES ('&<>"\'');
 SELECT node, hex(node) FROM t1;